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Simplify a few config_set() callbacks.
[libsigrok.git] / src / hardware / demo / demo.c
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1/*
2 * This file is part of the libsigrok project.
3 *
4 * Copyright (C) 2010 Uwe Hermann <uwe@hermann-uwe.de>
5 * Copyright (C) 2011 Olivier Fauchon <olivier@aixmarseille.com>
6 * Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
7 * Copyright (C) 2015 Bartosz Golaszewski <bgolaszewski@baylibre.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <stdlib.h>
25#include <unistd.h>
26#include <string.h>
27#include <math.h>
28#ifdef _WIN32
29#include <io.h>
30#include <fcntl.h>
31#define pipe(fds) _pipe(fds, 4096, _O_BINARY)
32#endif
33#include "libsigrok.h"
34#include "libsigrok-internal.h"
35
36#define LOG_PREFIX "demo"
37
38#define DEFAULT_NUM_LOGIC_CHANNELS 8
39#define DEFAULT_NUM_ANALOG_CHANNELS 4
40
41/* The size in bytes of chunks to send through the session bus. */
42#define LOGIC_BUFSIZE 4096
43/* Size of the analog pattern space per channel. */
44#define ANALOG_BUFSIZE 4096
45
46#define DEFAULT_ANALOG_AMPLITUDE 25
47#define ANALOG_SAMPLES_PER_PERIOD 20
48
49/* Logic patterns we can generate. */
50enum {
51 /**
52 * Spells "sigrok" across 8 channels using '0's (with '1's as
53 * "background") when displayed using the 'bits' output format.
54 * The pattern is repeated every 8 channels, shifted to the right
55 * in time by one bit.
56 */
57 PATTERN_SIGROK,
58
59 /** Pseudo-random values on all channels. */
60 PATTERN_RANDOM,
61
62 /**
63 * Incrementing number across 8 channels. The pattern is repeated
64 * every 8 channels, shifted to the right in time by one bit.
65 */
66 PATTERN_INC,
67
68 /** All channels have a low logic state. */
69 PATTERN_ALL_LOW,
70
71 /** All channels have a high logic state. */
72 PATTERN_ALL_HIGH,
73};
74
75/* Analog patterns we can generate. */
76enum {
77 /**
78 * Square wave.
79 */
80 PATTERN_SQUARE,
81 PATTERN_SINE,
82 PATTERN_TRIANGLE,
83 PATTERN_SAWTOOTH,
84};
85
86static const char *logic_pattern_str[] = {
87 "sigrok",
88 "random",
89 "incremental",
90 "all-low",
91 "all-high",
92};
93
94static const char *analog_pattern_str[] = {
95 "square",
96 "sine",
97 "triangle",
98 "sawtooth",
99};
100
101struct analog_gen {
102 int pattern;
103 float amplitude;
104 float pattern_data[ANALOG_BUFSIZE];
105 unsigned int num_samples;
106 struct sr_datafeed_analog packet;
107 float avg_val; /* Average value */
108 unsigned num_avgs; /* Number of samples averaged */
109};
110
111/* Private, per-device-instance driver context. */
112struct dev_context {
113 int pipe_fds[2];
114 GIOChannel *channel;
115 uint64_t cur_samplerate;
116 gboolean continuous;
117 uint64_t limit_samples;
118 uint64_t limit_msec;
119 uint64_t logic_counter;
120 uint64_t analog_counter;
121 int64_t starttime;
122 uint64_t step;
123 /* Logic */
124 int32_t num_logic_channels;
125 unsigned int logic_unitsize;
126 /* There is only ever one logic channel group, so its pattern goes here. */
127 uint8_t logic_pattern;
128 unsigned char logic_data[LOGIC_BUFSIZE];
129 /* Analog */
130 int32_t num_analog_channels;
131 GHashTable *ch_ag;
132 gboolean avg; /* True if averaging is enabled */
133 uint64_t avg_samples;
134};
135
136static const uint32_t drvopts[] = {
137 SR_CONF_DEMO_DEV,
138 SR_CONF_LOGIC_ANALYZER,
139 SR_CONF_OSCILLOSCOPE,
140};
141
142static const uint32_t scanopts[] = {
143 SR_CONF_NUM_LOGIC_CHANNELS,
144 SR_CONF_NUM_ANALOG_CHANNELS,
145};
146
147static const uint32_t devopts[] = {
148 SR_CONF_CONTINUOUS | SR_CONF_SET,
149 SR_CONF_LIMIT_SAMPLES | SR_CONF_GET | SR_CONF_SET,
150 SR_CONF_LIMIT_MSEC | SR_CONF_GET | SR_CONF_SET,
151 SR_CONF_SAMPLERATE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
152 SR_CONF_AVERAGING | SR_CONF_GET | SR_CONF_SET,
153 SR_CONF_AVG_SAMPLES | SR_CONF_GET | SR_CONF_SET,
154};
155
156static const uint32_t devopts_cg_logic[] = {
157 SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
158};
159
160static const uint32_t devopts_cg_analog[] = {
161 SR_CONF_PATTERN_MODE | SR_CONF_GET | SR_CONF_SET | SR_CONF_LIST,
162 SR_CONF_AMPLITUDE | SR_CONF_GET | SR_CONF_SET,
163};
164
165static const uint64_t samplerates[] = {
166 SR_HZ(1),
167 SR_GHZ(1),
168 SR_HZ(1),
169};
170
171static const uint8_t pattern_sigrok[] = {
172 0x4c, 0x92, 0x92, 0x92, 0x64, 0x00, 0x00, 0x00,
173 0x82, 0xfe, 0xfe, 0x82, 0x00, 0x00, 0x00, 0x00,
174 0x7c, 0x82, 0x82, 0x92, 0x74, 0x00, 0x00, 0x00,
175 0xfe, 0x12, 0x12, 0x32, 0xcc, 0x00, 0x00, 0x00,
176 0x7c, 0x82, 0x82, 0x82, 0x7c, 0x00, 0x00, 0x00,
177 0xfe, 0x10, 0x28, 0x44, 0x82, 0x00, 0x00, 0x00,
178 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
179 0xbe, 0xbe, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
180};
181
182SR_PRIV struct sr_dev_driver demo_driver_info;
183
184static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data);
185
186static int init(struct sr_dev_driver *di, struct sr_context *sr_ctx)
187{
188 return std_init(sr_ctx, di, LOG_PREFIX);
189}
190
191static void generate_analog_pattern(struct analog_gen *ag, uint64_t sample_rate)
192{
193 double t, frequency;
194 float value;
195 unsigned int num_samples, i;
196 int last_end;
197
198 sr_dbg("Generating %s pattern.", analog_pattern_str[ag->pattern]);
199
200 num_samples = ANALOG_BUFSIZE / sizeof(float);
201
202 switch (ag->pattern) {
203 case PATTERN_SQUARE:
204 value = ag->amplitude;
205 last_end = 0;
206 for (i = 0; i < num_samples; i++) {
207 if (i % 5 == 0)
208 value = -value;
209 if (i % 10 == 0)
210 last_end = i;
211 ag->pattern_data[i] = value;
212 }
213 ag->num_samples = last_end;
214 break;
215
216 case PATTERN_SINE:
217 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
218
219 /* Make sure the number of samples we put out is an integer
220 * multiple of our period size */
221 /* FIXME we actually need only one period. A ringbuffer would be
222 * usefull here.*/
223 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
224 num_samples--;
225
226 for (i = 0; i < num_samples; i++) {
227 t = (double) i / (double) sample_rate;
228 ag->pattern_data[i] = ag->amplitude *
229 sin(2 * M_PI * frequency * t);
230 }
231
232 ag->num_samples = num_samples;
233 break;
234
235 case PATTERN_TRIANGLE:
236 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
237
238 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
239 num_samples--;
240
241 for (i = 0; i < num_samples; i++) {
242 t = (double) i / (double) sample_rate;
243 ag->pattern_data[i] = (2 * ag->amplitude / M_PI) *
244 asin(sin(2 * M_PI * frequency * t));
245 }
246
247 ag->num_samples = num_samples;
248 break;
249
250 case PATTERN_SAWTOOTH:
251 frequency = (double) sample_rate / ANALOG_SAMPLES_PER_PERIOD;
252
253 while (num_samples % ANALOG_SAMPLES_PER_PERIOD != 0)
254 num_samples--;
255
256 for (i = 0; i < num_samples; i++) {
257 t = (double) i / (double) sample_rate;
258 ag->pattern_data[i] = 2 * ag->amplitude *
259 ((t * frequency) - floor(0.5f + t * frequency));
260 }
261
262 ag->num_samples = num_samples;
263 break;
264 }
265}
266
267static GSList *scan(struct sr_dev_driver *di, GSList *options)
268{
269 struct drv_context *drvc;
270 struct dev_context *devc;
271 struct sr_dev_inst *sdi;
272 struct sr_channel *ch;
273 struct sr_channel_group *cg, *acg;
274 struct sr_config *src;
275 struct analog_gen *ag;
276 GSList *devices, *l;
277 int num_logic_channels, num_analog_channels, pattern, i;
278 char channel_name[16];
279
280 drvc = di->priv;
281
282 num_logic_channels = DEFAULT_NUM_LOGIC_CHANNELS;
283 num_analog_channels = DEFAULT_NUM_ANALOG_CHANNELS;
284 for (l = options; l; l = l->next) {
285 src = l->data;
286 switch (src->key) {
287 case SR_CONF_NUM_LOGIC_CHANNELS:
288 num_logic_channels = g_variant_get_int32(src->data);
289 break;
290 case SR_CONF_NUM_ANALOG_CHANNELS:
291 num_analog_channels = g_variant_get_int32(src->data);
292 break;
293 }
294 }
295
296 devices = NULL;
297
298 sdi = g_malloc0(sizeof(struct sr_dev_inst));
299 sdi->status = SR_ST_ACTIVE;
300 sdi->model = g_strdup("Demo device");
301 sdi->driver = di;
302
303 devc = g_malloc(sizeof(struct dev_context));
304 devc->cur_samplerate = SR_KHZ(200);
305 devc->limit_samples = 0;
306 devc->limit_msec = 0;
307 devc->step = 0;
308 devc->continuous = FALSE;
309 devc->num_logic_channels = num_logic_channels;
310 devc->logic_unitsize = (devc->num_logic_channels + 7) / 8;
311 devc->logic_pattern = PATTERN_SIGROK;
312 devc->num_analog_channels = num_analog_channels;
313 devc->avg = FALSE;
314 devc->avg_samples = 0;
315
316 /* Logic channels, all in one channel group. */
317 cg = g_malloc0(sizeof(struct sr_channel_group));
318 cg->name = g_strdup("Logic");
319 for (i = 0; i < num_logic_channels; i++) {
320 sprintf(channel_name, "D%d", i);
321 ch = sr_channel_new(sdi, i, SR_CHANNEL_LOGIC, TRUE, channel_name);
322 cg->channels = g_slist_append(cg->channels, ch);
323 }
324 sdi->channel_groups = g_slist_append(NULL, cg);
325
326 /* Analog channels, channel groups and pattern generators. */
327 pattern = 0;
328 /* An "Analog" channel group with all analog channels in it. */
329 acg = g_malloc0(sizeof(struct sr_channel_group));
330 acg->name = g_strdup("Analog");
331 sdi->channel_groups = g_slist_append(sdi->channel_groups, acg);
332
333 devc->ch_ag = g_hash_table_new(g_direct_hash, g_direct_equal);
334 for (i = 0; i < num_analog_channels; i++) {
335 snprintf(channel_name, 16, "A%d", i);
336 ch = sr_channel_new(sdi, i + num_logic_channels, SR_CHANNEL_ANALOG,
337 TRUE, channel_name);
338 acg->channels = g_slist_append(acg->channels, ch);
339
340 /* Every analog channel gets its own channel group as well. */
341 cg = g_malloc0(sizeof(struct sr_channel_group));
342 cg->name = g_strdup(channel_name);
343 cg->channels = g_slist_append(NULL, ch);
344 sdi->channel_groups = g_slist_append(sdi->channel_groups, cg);
345
346 /* Every channel gets a generator struct. */
347 ag = g_malloc(sizeof(struct analog_gen));
348 ag->amplitude = DEFAULT_ANALOG_AMPLITUDE;
349 ag->packet.channels = cg->channels;
350 ag->packet.mq = 0;
351 ag->packet.mqflags = 0;
352 ag->packet.unit = SR_UNIT_VOLT;
353 ag->packet.data = ag->pattern_data;
354 ag->pattern = pattern;
355 ag->avg_val = 0.0f;
356 ag->num_avgs = 0;
357 g_hash_table_insert(devc->ch_ag, ch, ag);
358
359 if (++pattern == ARRAY_SIZE(analog_pattern_str))
360 pattern = 0;
361 }
362
363 sdi->priv = devc;
364 devices = g_slist_append(devices, sdi);
365 drvc->instances = g_slist_append(drvc->instances, sdi);
366
367 return devices;
368}
369
370static GSList *dev_list(const struct sr_dev_driver *di)
371{
372 return ((struct drv_context *)(di->priv))->instances;
373}
374
375static int dev_open(struct sr_dev_inst *sdi)
376{
377 sdi->status = SR_ST_ACTIVE;
378
379 return SR_OK;
380}
381
382static int dev_close(struct sr_dev_inst *sdi)
383{
384 sdi->status = SR_ST_INACTIVE;
385
386 return SR_OK;
387}
388
389static void clear_helper(void *priv)
390{
391 struct dev_context *devc;
392 GHashTableIter iter;
393 void *value;
394
395 devc = priv;
396
397 /* Analog generators. */
398 g_hash_table_iter_init(&iter, devc->ch_ag);
399 while (g_hash_table_iter_next(&iter, NULL, &value))
400 g_free(value);
401 g_hash_table_unref(devc->ch_ag);
402 g_free(devc);
403}
404
405static int cleanup(const struct sr_dev_driver *di)
406{
407 return std_dev_clear(di, clear_helper);
408}
409
410static int config_get(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
411 const struct sr_channel_group *cg)
412{
413 struct dev_context *devc;
414 struct sr_channel *ch;
415 struct analog_gen *ag;
416 int pattern;
417
418 if (!sdi)
419 return SR_ERR_ARG;
420
421 devc = sdi->priv;
422 switch (key) {
423 case SR_CONF_SAMPLERATE:
424 *data = g_variant_new_uint64(devc->cur_samplerate);
425 break;
426 case SR_CONF_LIMIT_SAMPLES:
427 *data = g_variant_new_uint64(devc->limit_samples);
428 break;
429 case SR_CONF_LIMIT_MSEC:
430 *data = g_variant_new_uint64(devc->limit_msec);
431 break;
432 case SR_CONF_AVERAGING:
433 *data = g_variant_new_boolean(devc->avg);
434 break;
435 case SR_CONF_AVG_SAMPLES:
436 *data = g_variant_new_uint64(devc->avg_samples);
437 break;
438 case SR_CONF_PATTERN_MODE:
439 if (!cg)
440 return SR_ERR_CHANNEL_GROUP;
441 /* Any channel in the group will do. */
442 ch = cg->channels->data;
443 if (ch->type == SR_CHANNEL_LOGIC) {
444 pattern = devc->logic_pattern;
445 *data = g_variant_new_string(logic_pattern_str[pattern]);
446 } else if (ch->type == SR_CHANNEL_ANALOG) {
447 ag = g_hash_table_lookup(devc->ch_ag, ch);
448 pattern = ag->pattern;
449 *data = g_variant_new_string(analog_pattern_str[pattern]);
450 } else
451 return SR_ERR_BUG;
452 break;
453 case SR_CONF_AMPLITUDE:
454 if (!cg)
455 return SR_ERR_CHANNEL_GROUP;
456 /* Any channel in the group will do. */
457 ch = cg->channels->data;
458 if (ch->type != SR_CHANNEL_ANALOG)
459 return SR_ERR_ARG;
460 ag = g_hash_table_lookup(devc->ch_ag, ch);
461 *data = g_variant_new_double(ag->amplitude);
462 break;
463 default:
464 return SR_ERR_NA;
465 }
466
467 return SR_OK;
468}
469
470static int config_set(uint32_t key, GVariant *data, const struct sr_dev_inst *sdi,
471 const struct sr_channel_group *cg)
472{
473 struct dev_context *devc;
474 struct analog_gen *ag;
475 struct sr_channel *ch;
476 GSList *l;
477 int logic_pattern, analog_pattern, ret;
478 unsigned int i;
479 const char *stropt;
480
481 devc = sdi->priv;
482
483 if (sdi->status != SR_ST_ACTIVE)
484 return SR_ERR_DEV_CLOSED;
485
486 ret = SR_OK;
487 switch (key) {
488 case SR_CONF_SAMPLERATE:
489 devc->cur_samplerate = g_variant_get_uint64(data);
490 break;
491 case SR_CONF_LIMIT_SAMPLES:
492 devc->limit_msec = 0;
493 devc->limit_samples = g_variant_get_uint64(data);
494 break;
495 case SR_CONF_LIMIT_MSEC:
496 devc->limit_msec = g_variant_get_uint64(data);
497 devc->limit_samples = 0;
498 break;
499 case SR_CONF_AVERAGING:
500 devc->avg = g_variant_get_boolean(data);
501 sr_dbg("%s averaging", devc->avg ? "Enabling" : "Disabling");
502 break;
503 case SR_CONF_AVG_SAMPLES:
504 devc->avg_samples = g_variant_get_uint64(data);
505 sr_dbg("Setting averaging rate to %" PRIu64, devc->avg_samples);
506 break;
507 case SR_CONF_PATTERN_MODE:
508 if (!cg)
509 return SR_ERR_CHANNEL_GROUP;
510 stropt = g_variant_get_string(data, NULL);
511 logic_pattern = analog_pattern = -1;
512 for (i = 0; i < ARRAY_SIZE(logic_pattern_str); i++) {
513 if (!strcmp(stropt, logic_pattern_str[i])) {
514 logic_pattern = i;
515 break;
516 }
517 }
518 for (i = 0; i < ARRAY_SIZE(analog_pattern_str); i++) {
519 if (!strcmp(stropt, analog_pattern_str[i])) {
520 analog_pattern = i;
521 break;
522 }
523 }
524 if (logic_pattern == -1 && analog_pattern == -1)
525 return SR_ERR_ARG;
526 for (l = cg->channels; l; l = l->next) {
527 ch = l->data;
528 if (ch->type == SR_CHANNEL_LOGIC) {
529 if (logic_pattern == -1)
530 return SR_ERR_ARG;
531 sr_dbg("Setting logic pattern to %s",
532 logic_pattern_str[logic_pattern]);
533 devc->logic_pattern = logic_pattern;
534 /* Might as well do this now, these are static. */
535 if (logic_pattern == PATTERN_ALL_LOW)
536 memset(devc->logic_data, 0x00, LOGIC_BUFSIZE);
537 else if (logic_pattern == PATTERN_ALL_HIGH)
538 memset(devc->logic_data, 0xff, LOGIC_BUFSIZE);
539 } else if (ch->type == SR_CHANNEL_ANALOG) {
540 if (analog_pattern == -1)
541 return SR_ERR_ARG;
542 sr_dbg("Setting analog pattern for channel %s to %s",
543 ch->name, analog_pattern_str[analog_pattern]);
544 ag = g_hash_table_lookup(devc->ch_ag, ch);
545 ag->pattern = analog_pattern;
546 } else
547 return SR_ERR_BUG;
548 }
549 break;
550 case SR_CONF_AMPLITUDE:
551 if (!cg)
552 return SR_ERR_CHANNEL_GROUP;
553 for (l = cg->channels; l; l = l->next) {
554 ch = l->data;
555 if (ch->type != SR_CHANNEL_ANALOG)
556 return SR_ERR_ARG;
557 ag = g_hash_table_lookup(devc->ch_ag, ch);
558 ag->amplitude = g_variant_get_double(data);
559 }
560 break;
561 default:
562 ret = SR_ERR_NA;
563 }
564
565 return ret;
566}
567
568static int config_list(uint32_t key, GVariant **data, const struct sr_dev_inst *sdi,
569 const struct sr_channel_group *cg)
570{
571 struct sr_channel *ch;
572 GVariant *gvar;
573 GVariantBuilder gvb;
574
575 if (key == SR_CONF_SCAN_OPTIONS) {
576 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
577 scanopts, ARRAY_SIZE(scanopts), sizeof(uint32_t));
578 return SR_OK;
579 }
580
581 if (key == SR_CONF_DEVICE_OPTIONS && !sdi) {
582 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
583 drvopts, ARRAY_SIZE(drvopts), sizeof(uint32_t));
584 return SR_OK;
585 }
586
587 if (!sdi)
588 return SR_ERR_ARG;
589
590 if (!cg) {
591 switch (key) {
592 case SR_CONF_DEVICE_OPTIONS:
593 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_UINT32,
594 devopts, ARRAY_SIZE(devopts), sizeof(uint32_t));
595 break;
596 case SR_CONF_SAMPLERATE:
597 g_variant_builder_init(&gvb, G_VARIANT_TYPE("a{sv}"));
598 gvar = g_variant_new_fixed_array(G_VARIANT_TYPE("t"), samplerates,
599 ARRAY_SIZE(samplerates), sizeof(uint64_t));
600 g_variant_builder_add(&gvb, "{sv}", "samplerate-steps", gvar);
601 *data = g_variant_builder_end(&gvb);
602 break;
603 default:
604 return SR_ERR_NA;
605 }
606 } else {
607 /* Any channel in the group will do. */
608 ch = cg->channels->data;
609 switch (key) {
610 case SR_CONF_DEVICE_OPTIONS:
611 if (ch->type == SR_CHANNEL_LOGIC)
612 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
613 devopts_cg_logic, ARRAY_SIZE(devopts_cg_logic),
614 sizeof(uint32_t));
615 else if (ch->type == SR_CHANNEL_ANALOG)
616 *data = g_variant_new_fixed_array(G_VARIANT_TYPE_INT32,
617 devopts_cg_analog, ARRAY_SIZE(devopts_cg_analog),
618 sizeof(uint32_t));
619 else
620 return SR_ERR_BUG;
621 break;
622 case SR_CONF_PATTERN_MODE:
623 if (ch->type == SR_CHANNEL_LOGIC)
624 *data = g_variant_new_strv(logic_pattern_str,
625 ARRAY_SIZE(logic_pattern_str));
626 else if (ch->type == SR_CHANNEL_ANALOG)
627 *data = g_variant_new_strv(analog_pattern_str,
628 ARRAY_SIZE(analog_pattern_str));
629 else
630 return SR_ERR_BUG;
631 break;
632 default:
633 return SR_ERR_NA;
634 }
635 }
636
637 return SR_OK;
638}
639
640static void logic_generator(struct sr_dev_inst *sdi, uint64_t size)
641{
642 struct dev_context *devc;
643 uint64_t i, j;
644 uint8_t pat;
645
646 devc = sdi->priv;
647
648 switch (devc->logic_pattern) {
649 case PATTERN_SIGROK:
650 memset(devc->logic_data, 0x00, size);
651 for (i = 0; i < size; i += devc->logic_unitsize) {
652 for (j = 0; j < devc->logic_unitsize; j++) {
653 pat = pattern_sigrok[(devc->step + j) % sizeof(pattern_sigrok)] >> 1;
654 devc->logic_data[i + j] = ~pat;
655 }
656 devc->step++;
657 }
658 break;
659 case PATTERN_RANDOM:
660 for (i = 0; i < size; i++)
661 devc->logic_data[i] = (uint8_t)(rand() & 0xff);
662 break;
663 case PATTERN_INC:
664 for (i = 0; i < size; i++) {
665 for (j = 0; j < devc->logic_unitsize; j++) {
666 devc->logic_data[i + j] = devc->step;
667 }
668 devc->step++;
669 }
670 break;
671 case PATTERN_ALL_LOW:
672 case PATTERN_ALL_HIGH:
673 /* These were set when the pattern mode was selected. */
674 break;
675 default:
676 sr_err("Unknown pattern: %d.", devc->logic_pattern);
677 break;
678 }
679}
680
681static void send_analog_packet(struct analog_gen *ag,
682 struct sr_dev_inst *sdi,
683 uint64_t *analog_sent,
684 uint64_t analog_todo)
685{
686 struct sr_datafeed_packet packet;
687 struct dev_context *devc;
688 uint64_t sending_now, to_avg;
689 int ag_pattern_pos;
690 unsigned int i;
691
692 devc = sdi->priv;
693 packet.type = SR_DF_ANALOG;
694 packet.payload = &ag->packet;
695
696 if (!devc->avg) {
697 ag_pattern_pos = devc->analog_counter % ag->num_samples;
698 sending_now = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
699 ag->packet.data = ag->pattern_data + ag_pattern_pos;
700 ag->packet.num_samples = sending_now;
701 sr_session_send(sdi, &packet);
702
703 /* Whichever channel group gets there first. */
704 *analog_sent = MAX(*analog_sent, sending_now);
705 } else {
706 ag_pattern_pos = devc->analog_counter % ag->num_samples;
707 to_avg = MIN(analog_todo, ag->num_samples-ag_pattern_pos);
708
709 for (i = 0; i < to_avg; i++) {
710 ag->avg_val = (ag->avg_val +
711 *(ag->pattern_data +
712 ag_pattern_pos + i)) / 2;
713 ag->num_avgs++;
714 /* Time to send averaged data? */
715 if (devc->avg_samples > 0 &&
716 ag->num_avgs >= devc->avg_samples)
717 goto do_send;
718 }
719
720 if (devc->avg_samples == 0) {
721 /* We're averaging all the samples, so wait with
722 * sending until the very end.
723 */
724 *analog_sent = ag->num_avgs;
725 return;
726 }
727
728do_send:
729 ag->packet.data = &ag->avg_val;
730 ag->packet.num_samples = 1;
731
732 sr_session_send(sdi, &packet);
733 *analog_sent = ag->num_avgs;
734
735 ag->num_avgs = 0;
736 ag->avg_val = 0.0f;
737 }
738}
739
740/* Callback handling data */
741static int prepare_data(int fd, int revents, void *cb_data)
742{
743 struct sr_dev_inst *sdi;
744 struct dev_context *devc;
745 struct sr_datafeed_packet packet;
746 struct sr_datafeed_logic logic;
747 struct analog_gen *ag;
748 GHashTableIter iter;
749 void *value;
750 uint64_t logic_todo, analog_todo, expected_samplenum, analog_sent, sending_now;
751 int64_t time, elapsed;
752
753 (void)fd;
754 (void)revents;
755
756 sdi = cb_data;
757 devc = sdi->priv;
758 logic_todo = analog_todo = 0;
759
760 /* How many samples should we have sent by now? */
761 time = g_get_monotonic_time();
762 elapsed = time - devc->starttime;
763 expected_samplenum = elapsed * devc->cur_samplerate / 1000000;
764
765 /* But never more than the limit, if there is one. */
766 if (!devc->continuous)
767 expected_samplenum = MIN(expected_samplenum, devc->limit_samples);
768
769 /* Of those, how many do we still have to send? */
770 if (devc->num_logic_channels)
771 logic_todo = expected_samplenum - devc->logic_counter;
772 if (devc->num_analog_channels)
773 analog_todo = expected_samplenum - devc->analog_counter;
774
775 while (logic_todo || analog_todo) {
776 /* Logic */
777 if (logic_todo > 0) {
778 sending_now = MIN(logic_todo, LOGIC_BUFSIZE / devc->logic_unitsize);
779 logic_generator(sdi, sending_now * devc->logic_unitsize);
780 packet.type = SR_DF_LOGIC;
781 packet.payload = &logic;
782 logic.length = sending_now * devc->logic_unitsize;
783 logic.unitsize = devc->logic_unitsize;
784 logic.data = devc->logic_data;
785 sr_session_send(sdi, &packet);
786 logic_todo -= sending_now;
787 devc->logic_counter += sending_now;
788 }
789
790 /* Analog, one channel at a time */
791 if (analog_todo > 0) {
792 analog_sent = 0;
793
794 g_hash_table_iter_init(&iter, devc->ch_ag);
795 while (g_hash_table_iter_next(&iter, NULL, &value)) {
796 send_analog_packet(value, sdi,
797 &analog_sent, analog_todo);
798 }
799 analog_todo -= analog_sent;
800 devc->analog_counter += analog_sent;
801 }
802 }
803
804 if (!devc->continuous
805 && (!devc->num_logic_channels || devc->logic_counter >= devc->limit_samples)
806 && (!devc->num_analog_channels || devc->analog_counter >= devc->limit_samples)) {
807 /* If we're averaging everything - now is the time to send data */
808 if (devc->avg_samples == 0) {
809 g_hash_table_iter_init(&iter, devc->ch_ag);
810 while (g_hash_table_iter_next(&iter, NULL, &value)) {
811 ag = value;
812 packet.type = SR_DF_ANALOG;
813 packet.payload = &ag->packet;
814 ag->packet.data = &ag->avg_val;
815 ag->packet.num_samples = 1;
816 sr_session_send(sdi, &packet);
817 }
818 }
819
820 sr_dbg("Requested number of samples reached.");
821 dev_acquisition_stop(sdi, cb_data);
822 return TRUE;
823 }
824
825 return TRUE;
826}
827
828static int dev_acquisition_start(const struct sr_dev_inst *sdi, void *cb_data)
829{
830 struct dev_context *devc;
831 GHashTableIter iter;
832 void *value;
833
834 (void)cb_data;
835
836 if (sdi->status != SR_ST_ACTIVE)
837 return SR_ERR_DEV_CLOSED;
838
839 devc = sdi->priv;
840 devc->continuous = !devc->limit_samples;
841 devc->logic_counter = devc->analog_counter = 0;
842
843 /*
844 * Setting two channels connected by a pipe is a remnant from when the
845 * demo driver generated data in a thread, and collected and sent the
846 * data in the main program loop.
847 * They are kept here because it provides a convenient way of setting
848 * up a timeout-based polling mechanism.
849 */
850 if (pipe(devc->pipe_fds)) {
851 sr_err("%s: pipe() failed", __func__);
852 return SR_ERR;
853 }
854
855 g_hash_table_iter_init(&iter, devc->ch_ag);
856 while (g_hash_table_iter_next(&iter, NULL, &value))
857 generate_analog_pattern(value, devc->cur_samplerate);
858
859 devc->channel = g_io_channel_unix_new(devc->pipe_fds[0]);
860 g_io_channel_set_flags(devc->channel, G_IO_FLAG_NONBLOCK, NULL);
861
862 /* Set channel encoding to binary (default is UTF-8). */
863 g_io_channel_set_encoding(devc->channel, NULL, NULL);
864
865 /* Make channels unbuffered. */
866 g_io_channel_set_buffered(devc->channel, FALSE);
867
868 sr_session_source_add_channel(sdi->session, devc->channel,
869 G_IO_IN | G_IO_ERR, 40, prepare_data, (void *)sdi);
870
871 /* Send header packet to the session bus. */
872 std_session_send_df_header(sdi, LOG_PREFIX);
873
874 /* We use this timestamp to decide how many more samples to send. */
875 devc->starttime = g_get_monotonic_time();
876
877 return SR_OK;
878}
879
880static int dev_acquisition_stop(struct sr_dev_inst *sdi, void *cb_data)
881{
882 struct dev_context *devc;
883 struct sr_datafeed_packet packet;
884
885 (void)cb_data;
886
887 devc = sdi->priv;
888 sr_dbg("Stopping acquisition.");
889
890 sr_session_source_remove_channel(sdi->session, devc->channel);
891 g_io_channel_shutdown(devc->channel, FALSE, NULL);
892 g_io_channel_unref(devc->channel);
893 devc->channel = NULL;
894
895 /* Send last packet. */
896 packet.type = SR_DF_END;
897 sr_session_send(sdi, &packet);
898
899 return SR_OK;
900}
901
902SR_PRIV struct sr_dev_driver demo_driver_info = {
903 .name = "demo",
904 .longname = "Demo driver and pattern generator",
905 .api_version = 1,
906 .init = init,
907 .cleanup = cleanup,
908 .scan = scan,
909 .dev_list = dev_list,
910 .dev_clear = NULL,
911 .config_get = config_get,
912 .config_set = config_set,
913 .config_list = config_list,
914 .dev_open = dev_open,
915 .dev_close = dev_close,
916 .dev_acquisition_start = dev_acquisition_start,
917 .dev_acquisition_stop = dev_acquisition_stop,
918 .priv = NULL,
919};
Hardware access and backend lib